How to use a 12v 4.5Ah battery to charge my phone?? Answered
ok, here is something similar to what I have. I got mine as a spare battery from a garage door opener.
12v 4.5 Ah battery
I would like to know how to build the easiest usb charger with this battery. I would be charging a couple things at a time, a phone and what not. would I be able to just take apart a 12v cigarette lighter charger and wire it to the terminals?
thanks in advance